Daily Practice

Foundation

27th March 2026

5 questions · Foundation tier · 282 questions in this band

1
Correlation and Causation (Foundation)
Two variables have a correlation coefficient close to 0. What does this suggest?
2
Risk (Foundation)
Using your answers to the previous question, find the relative risk for phone users compared with non-users, and interpret it.
3
Skewness by Inspection
A shop's till receipts have mode 5 pounds, median 8 pounds, mean 15 pounds. State the type of skew and give a reason.
4
Percentiles
In a data set of 200 values, at what position, counting from the smallest, would you expect to find the 25th percentile?
5
Crude Rate and Rates of Change
A city's population grows from 50,000 to 52,000 in one year. Find the percentage rate of change.

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